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FS in Los Angeles only: INCREDIBLE 2 x 12" sealed subwoofer setup

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  • FS in Los Angeles only: INCREDIBLE 2 x 12" sealed subwoofer setup


    We recently got a piano, and that required a reconfiguration of the stereo and so despite how much I've enjoyed these, I have to let them go.

    It's two 55 liter sealed boxes, each with a DVC 4 ohm (so in series for 8 ohms) TC-1000 (later known as the Epic series) with the aluminum cone, shorting rings, 22mm of xmax, and a strong enough motor to not need a huge box, resulting in a Qtc of 0.62 for each box.

    The subwoofers are in parallel for a final 4 ohm load, and driven by a Keiga 52100 amplifier which has a 1000W RMS output at 0.1% THD for a very healthy 500 WRMS to each subwoofer. It additionally has a 25 Hz. boost, which is excellent for home theater, especially when used in conjuction with room EQ (always best to EQ down, not up, so the boost in the first place really helps with the low-end roll-off). This has a switching output stage that is nearly 90% efficient, and a linear power supply, so it weighs a solid 30 lbs. Was used externally. Amp has an auto-on that works very well - always comes on even with little signal, and does NOT turn off after a few minutes in the middle of a song/movie.

    Between having two separate boxes which helps flatten out the room response (and is much more flexible than one huge box), and having basically unlimited dynamic range and extension from having so much volume displacement, this has been one of the best subwoofer solutions I've ever had. Definitely local pickup in Los Angeles only due to weight/bulk!

    Per Unibox simulation software, this models at 107db at xmax at 20 Hz., and

    Looking for a pretty firm $635, which I feel is fair for this level of equipment. That's also only a bit more than the amplifier by itself new!

    Driver specs (this took a long time to find):
    Fs 23.00 Hz
    Re 7.60 Ohm
    Qms 3.90
    Qes 0.49
    Sd 500.0 cm2
    Vas 97.0 l
    Xmax peak 22.00 mm
    Le 2.49 mH
    Le2 0.00 mH
    Re2 0.00 Ohm
    Nominal Power 500.0 W

    here's the slightly later DVC 2 ohm version of this driver, when they changed the name to Epic, and put their logo on the cone:

    Amplifier specs: